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Molecular self-assembly on surfaces of organic conducting salts: Epitaxial monolayer films of naphthalene on the (001) surface of (TMTSF)(2)PF6

Molecular self-assembly on surfaces of organic conducting salts: Epitaxial monolayer films of naphthalene on the (001) surface of (TMTSF)(2)PF6
Molecular self-assembly on surfaces of organic conducting salts: Epitaxial monolayer films of naphthalene on the (001) surface of (TMTSF)(2)PF6
Pristine and naphthalene-adsorbed (001) surfaces of the organic conducting salt (TMTSF)(2)PF6 were examined by scanning tunneling microscopy (STM) to determine the structure of epitaxial monolayer films of naphthalene on the (001) surface. The observed STM images were interpreted by calculating partial electron density plots of the surface, and for naphthalene-adsorbed surfaces, by carrying out Monte Carlo simulations for the adsorption of a naphthalene molecule on the surface. The STM images recorded for the pristine (001) surface correspond to the cation layer of (TMTSF)2PF6, and each circular bright spot of the molecular-resolution STM images represents the three hydrogen atoms of the most protruding methyl group of a TMTSF molecule on the (001) surface. Naphthalene molecules adsorbed on this surface form a pseudomorphic (1 x 1) overlayer structure with respect to the underlying substrate. The naphthalene overlayer shows mechanical stability against etching by the scanning tip. An identical overlayer structure of naphthalene was obtained from several different preparation methods. On the cation-layer (001) surface naphthalene is adsorbed on each "four-methyl-step'' defined by four methyl groups of two adjacent TMTSF molecules within each TMTSF stack.
scanning-tunneling-microscopy, superconductor (bedt-ttf)2cu(ncs)2, electronic-structure, bedt-ttf, stm, pt(111), graphite, benzene, images, afm
1089-5647
7394-7402
Bartlett, P. N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Essex, J. W.
1f409cfe-6ba4-42e2-a0ab-a931826314b5
Koo, H. J. I. S.
1e263c8b-3d66-47bb-8fef-5a78bd6b4df2
Robertson, N.
6baa6741-1e83-422f-964b-2b7a0b03f07a
Whangbo, M. H.
d8ab62cd-f2a5-455b-a697-1c0e1b04d50c
Bartlett, P. N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Essex, J. W.
1f409cfe-6ba4-42e2-a0ab-a931826314b5
Koo, H. J. I. S.
1e263c8b-3d66-47bb-8fef-5a78bd6b4df2
Robertson, N.
6baa6741-1e83-422f-964b-2b7a0b03f07a
Whangbo, M. H.
d8ab62cd-f2a5-455b-a697-1c0e1b04d50c

Bartlett, P. N., Essex, J. W., Koo, H. J. I. S., Robertson, N. and Whangbo, M. H. (2000) Molecular self-assembly on surfaces of organic conducting salts: Epitaxial monolayer films of naphthalene on the (001) surface of (TMTSF)(2)PF6. Journal of Physical Chemistry B, 104 (31), 7394-7402. (doi:10.1021/jp000013z).

Record type: Article

Abstract

Pristine and naphthalene-adsorbed (001) surfaces of the organic conducting salt (TMTSF)(2)PF6 were examined by scanning tunneling microscopy (STM) to determine the structure of epitaxial monolayer films of naphthalene on the (001) surface. The observed STM images were interpreted by calculating partial electron density plots of the surface, and for naphthalene-adsorbed surfaces, by carrying out Monte Carlo simulations for the adsorption of a naphthalene molecule on the surface. The STM images recorded for the pristine (001) surface correspond to the cation layer of (TMTSF)2PF6, and each circular bright spot of the molecular-resolution STM images represents the three hydrogen atoms of the most protruding methyl group of a TMTSF molecule on the (001) surface. Naphthalene molecules adsorbed on this surface form a pseudomorphic (1 x 1) overlayer structure with respect to the underlying substrate. The naphthalene overlayer shows mechanical stability against etching by the scanning tip. An identical overlayer structure of naphthalene was obtained from several different preparation methods. On the cation-layer (001) surface naphthalene is adsorbed on each "four-methyl-step'' defined by four methyl groups of two adjacent TMTSF molecules within each TMTSF stack.

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More information

Published date: 10 August 2000
Keywords: scanning-tunneling-microscopy, superconductor (bedt-ttf)2cu(ncs)2, electronic-structure, bedt-ttf, stm, pt(111), graphite, benzene, images, afm

Identifiers

Local EPrints ID: 18961
URI: https://eprints.soton.ac.uk/id/eprint/18961
ISSN: 1089-5647
PURE UUID: 41476362-c5a9-4ce4-b38f-ae9a473f6d9f
ORCID for P. N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for J. W. Essex: ORCID iD orcid.org/0000-0003-2639-2746

Catalogue record

Date deposited: 05 Jan 2006
Last modified: 06 Jun 2018 13:10

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Contributors

Author: P. N. Bartlett ORCID iD
Author: J. W. Essex ORCID iD
Author: H. J. I. S. Koo
Author: N. Robertson
Author: M. H. Whangbo

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